Expanding piston-packing.



. PAT'ENTED MAR. 19, ea? A.P.BALLARD. EXPANDING PISTON PAGKIN APPLICATION FILED JULY 6. 1906.

fiaZZard 3 piston-packings; and it consistsin' the novel I ing movement of the said heads is limited by di'icel spring surrounds the rod and is interder 5% and its. mail the cylinder and the possibility of leakage UN i'iill lii o i.

.. .Yillijii FAHREN BALLARD or SEGUNDO,COLORADO.

exeemmoie. PISTON-PACK5NQ.

Specification of Letters Patent.

fatented March 19, 1907.

Application filed July 5, 19%, Serial 110325.012.

Too/"1. 111/. on, zlrL 'IH/Ll/j ('(mcern:

Be it known that I ARTHUR FARREN BAL- LARD, a citizen of the United States, residing at Segundo, in thecounty of Las Animas and. State of Colorado, have invented anew and useful Expanding Piston-Packing, of which the following is a specifieetion.

This invention. has relation to expanding construction and agrengement of its ports, as hereinafter shown and described.

The objeet of the invention is to providee peeking especially adopted to be used upon theipistons of pumps. l I

' The packing ooneists of a pair of oppositely-disposeol cone-shaped heads slitlably looeted at the end of the piston-rod. 'The slidn. shoulder provided on the rod and. a seouringmeans, such no it top or enlarged heed, provided at the end of the rod. A oylim posed between the opposite cone-surfaces of the said heads. About the said spring and between the said. heads are loooted rings, which may he of any desired material, such or; fiber, rubber, asbestos, 8w.

The prime object of the invention, is to provide means for expanding the packing laterally as the piston is performing its work. By so doing tl 1e edge of the necking is brought in to positive contact with the inner Wall of about the piston absolutely prevented. The said plSiKribl'iLiLLlS aieudapted to move longitudinally upon the shaft, end in so (hing-the oppositel wdisposed oone-feoes expan the spring, which in turn expands the packing and produces the desired effect.

in the aeeompmiying drawing Figure l is. a. longitudinal sectional view of the expomling-piston. fl is a. side elevation of the some, sl'iowing one howl moved away from its abutment. l f I; M a side elevation of the seine, sl kg the other head moved away from it. (.lmtnieot. Fig. 4 is o transverse {5L tionel View of the rod and spring.

The t( 1 ro ,l t is suitably mounted foz reeiyn'ocelion in. the cylinder 2; The said rod 1 is provided noniite enrl with the shouh preferably i ("Hi3 53 threaded P at upon the one oi. the 11' normally abutting the other head normally abutting against the nut 6. The central bore of the said heads 5 5 is sufficiently larg iocomparisonfto the diameter ofthe eiids olthe rod 1 to ermit of sliding with relation to the longitu inelaxis of the seio rod. The inner faces of the heads 5 5 are provided with the op ositely-disposed cones 7 7 The bases of semi cones, however, termineteshort of the heads; and the flat annular surfaces 8 extend from the bases of the cones tothe periphery of he said heads,

The cylindrical sprin q U i is interposed betweenthe heads and hears at its ends] periphery of the said upon the oone snrleees 7 7 of the said heads.

The mid cylindrieel spring 9. encircles that portion of the piston-rod 1 which. isiooeted between the said heads 5 5. The ends of the spring 9 may ove formed so that the thereof do not meet each other. "Whenthis is the ease, the spring ietrnly eire'n-ler-ii'v. ero se-eeif-tion. When the ends overlap, the Spring is slightly s iral in oroes-seotion The spring with over an ing ends re 'uireil, when soft per-.king, sum as cord or as est-0s, is used. The spring with edges tlietmio not quite meet is used when paokings of harder material is Used. The peeking-rings it) sfdl'roundthe spring 9 and are located between. the cone-faces 7 '7 Oflll'ifi head55.. I

Froin. the foiegoing description it is obvious that when the piston is moved within the cylinder 2 in one direotion'end is, for i netnnoe forcing weier the piston-head 5, which is subjected. to theresistence of the element being operoted. upon, will mm 6 along the rod 1 longitudinally. Such move- 'Hlfifii) is very slight. It is suflicient, however.

to ransetlie conical surfau'es 7 ofthe said piston-heads to approach nearer each other, and the emleof the spring '9- bearing against the said oone-suflaoes are opened and the said spi-ing'is expanded, which in turn expands the peeking-rings i0 and causes the edges of.

the exmie to positively engage the inI'ie-r surfeoes of the eylinder and prevent the possibility of leakage of. the element being operotei'l upon about the piston. As both of said heads 5 are Sllllll-iDlY located, the movement above described occurs at the reciprocation oi the rod 2 in either iiireetion. The annular ms 2 which are alisnosed'a-t ri nt angles rlep. or the spring may be with the longitudinai axis of the rod 1, cause l ently slidably mounted for limited movesenses the end of the packing-rings to pass from the conical surfaces 7 squarely against the inner surfaces of the cylinder 2 and prevents any tendency-of the end packing-rings from wedging between the cylinder and the heads 5 5. As the paeking-rings wear the spring 9 will expand and follow the same.

Having described my invention, what 1 claim as'new, and desire to secure by Letters Patent, is

1. A douhle-acting pressure-piston comprising heads-of like contour, packing located between the heads and connecting means for the head upon which the heads are inde endment.

2. A douhle-acting pressure-piston comprising heads, paching located between the heads and a rod upon which the heads are in-- dependently slidahly mounted for limited movement.

3. A double-acting pressure-piston comprising conical heaes, packing located be tween the heads and connecting means for l the heads upon which the heads are inde pendently slidahly mounted for limited movement.

4. A pressure-piston comprising conical heads, a spring hearing at its ends upon the conical surfaces of the heads, packing located around. the springs and between the heads and connecting means for the heads upon which the heads are slidahly mounted for limited movement.

5. A pressure-piston comprising conical heads, a sprin hearing at its ends upon the conical surfaces of the heads and overlapping at its edges, packing located around. the spring, and between the heads and connecting means for the heads upon which the heads are slidably mounted for limited movement.

in testimony the-ti claim the foregoing as my own I have hereto afiixed my signature 1 in the presence of two witnesses.

ARTHUR FARREN BALLARD. Witnesses W. S. DUN -IAM,

J om: McKEown 

